Authentication device



FIG. 1 is a top view of an authentication device illustrating our new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a front face view thereof; and,

FIG. 6 is a back face view thereof. 

The ornamental design for an authentication device, as shown and described. 